For many years, telecommunication networks have steadily grown in size and complexity due to the continually growing of users requirements for dynamicity, adaptability and security. The Internet will so support service convergence for this next network’s generation. It also has to provide and guarantee Quality of Services to different types of services, where each service may get its own requirements. Providing and managing such networks is not an easy task. These different features may require more intelligent and dynamic behavior from network management. Existing approaches in network management do not support such a dynamic behavior. This paper presents a behavior-based multi-agent solution to manage dynamic telecommunication networks. The proposed solution is based on a Diffsery network by implementing a multi-agent system within Diffsery networks. The impact of an intelligent network management within Diffsery is also analyzed.